Lower grille



FIG. 1 is a front perspective view of a lower grille showing our new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a top view thereof;

FIG. 5 is a bottom view thereof; and,

FIG. 6 is a side view thereof.

It will be understood that the broken lines shown in the drawings illustrate portions of the lower grille that form no part of the claimed design. 

CLAIM The ornamental design for a lower grille, as shown and described. 